field theodolite

例句：

1. 1. The field theodolite was used to measure the angle of the sun's rays.
   大地测量仪被用来测量太阳光线的角度。
2. 2. The field theodolite was used to measure the distance between two points on the earth's surface.
   大地测量仪被用来测量地球表面两点之间的距离。
3. 3. The field theodolite was used to measure the height of the sun above the horizon.
   大地测量仪被用来测量太阳在地平线上的高度。